Maximum body envelope

Exact dimensions. True size, no printing tolerance added.

STEP STL free, CC BY 4.0 (credit "Xem Studio")

Dimensions

dimension	body
value	24.5–26.5 × 15.5–17.5 mm

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From the full sheet

9V battery (PP3, 6LR61): every size, notes, mating features and sources. What are the dimensions of a 9V battery?